This SSE Voltage Battery Tester is built for portability and better usability, it is a good choice for entry-level drone flyers and hobbyists. It provides a quick reading to determine if battery has charge. With a four-character lighted digital display, this battery voltage tester is easy to read with accuracy. Small design makes it a very portable and always handy for use. Compatible with Yuneec Q500, Q500+, Q500 4K and Typhoon H Batteries.